Stop-motion.



N0.v892, 915. PATENTED JULY 7, 1908; E. E. TALIAFERRO.

STOP MOTION.

APPLIQATION FILED JULY 18, 1907.

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WITNESSES 993N705 aim-Q2222. a zafez'ra 62f W r r6 Mala A m 0 A TTOHNEYS No. 892,915. PATENTBD JULY 7, 1908.,

E. E. TALIAF/ERRO.

STOP MOTION. APPLIOATION FILED JULY 13. 1991.

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WITNESSES A TTOHNE rs- 30, 1906, for a blacking machine.

UNITED STATES PATENT OFFICE.

EDWARD ELLETT TALIAFERRO, OF COLORADO SPRINGS, COLORADO, ASSIGNOR OF OlTE- SIXTH TO HARRY SPINGLER, OF COLORADO SPRINGS, COLORADO.

s'ror-mo'rron.

Specification of Letters Patent.

Patented July 7, 1908.

Original application filed June 30, 1906, Serial No. 824,180. Divided. and this application filed July 18, 1907. Serial No. 384,338.

To all whom it may concern:

Be it known that I, EDWARD ELLETT TALIAFERRO, a citizen of the United States, and a resident of Colorado Springs, in the county of El Paso and State of Colorado, have invented a new and Improved Stop- Motion, of which the-following 1s a full, clear, and exact description.

My invention relates to stop motions, that is to say, devices for disconnecting driven parts from driving members, in such manner as to avoid breakage in case the movement of one or more of the driven parts is obstructed.

My invention further relates to means whereby the power is automatically shut off whenever a driven part is unduly obstructed in its movement.

This application is a division of my pending application Serial No. 324,180, filed June Reference is to be had to the accompanying drawings formin a part of this specification, in which simi ar characters of reference indicate corresponding parts in all the figures.

Figure 1 isa side elevation showing an electric circuit including an electric motor, and also showing the electric circuit as closed so that the motor is in action andthe driving and driven members engaged in the performance of their duties, the machine being in action; Fig. 2 is a fragmentary section upon the line 2-2 of Fig. 1, looking in the direction of the arrow, and showing a worm and a gear meshing therewith, the worm being adapted to move endwise whenever the driven member is obstructed; Fig. 3 is a view somewhat similar to Fig. 1, but showing the condition of the mechanism after the longitudinal movement of the work has disconnected the driving and driven members and has caused the electric circuit to be %pened, thereby stopping the motor; and 1g. 4 is a vertical cross section u on the line 44. of Fig. 1, looking in the irection of the arrow, and showing the details of the work and the means for itstemporary connection with the shaft passing axiallythrough it.

An electric motor is shown at 5. Connected with it is a wire 6 which leads to a hand switch 7. From the latter a wire 8 leads to a battery 9. From this battery a wire 10 leads to a contact spring 11. This "contact spring 11 and another one 12 similar to it, are placed upon opposite sides of a block 13 o insulating material. From the contact spring 12, a wire 14 leads to the motor 5. The motor is provided with a revoluble armature 15, from which extends a shaft 16 used as a driving shaft for many of the movable parts.

A pin 17 projects partially from this shaft and is ada ted to enter a slot 18 in a threaded cylindrical worm 19 which fits loosely uponthe shaft 16. A washer 21 fits loosely upon the shaft 16. A lever 23 is rovided with a Y 22 which extends upward y and intermethe sleeve 19. The lever 23 is journaled upon a pivot pin 24 and is rovided at its lower end with a hook 25, the atter partially encircling the lower end of a lever 26, pivotally mounted upon a pin 27. A'leaf spring 28 engages the lower end of the lever 26 and is secured rigidly to a mounting 28 so that the spring presses constantly against the lever 26 and is adapted to move the latter slightly to the right, according to the view shown in Fig. 3. The lever 26 is provided with a portion 29 having a shou der 3O integral therewith. A foot 31, having a substantially arcuate form, is rovided with a shoulder 32 which is ada te to engage the shoulder 30, the foot 31 being integral with a lever 33 journaled upona pin 34, and engaged by a spring 35, whereby it is normally retained in a predetermined osition, as indicated in Fig. 3. Connecte with the upper end of the lever 33 is a rod 36, which is pulleddownwardly by hand or otherwise,when the mechanism is to be started in motion.

A stop pin 37 is engaged by the lever whenever the rod 36 is drawn downwardly to its limit, in which event the shoulder 32 looks against the shoulder 30 as soon as the pull upon the rod 36 is released. When the shoulder 32 slips over the shoulder 30, the lower'end of (when the machine is running) the the right, according to Figs. 3 and 4. Milled nuts 39, 40 are threaded internally and mounted upon the shaft, which is threaded externally for the purpose of receiving them.

' These nuts are adjustable; the nut 39 serves as an adjusting nut and the nut 40 as a lock nut. By aid of these nuts the tension of the spring 38 may be regulated within certaln limits at will.

A worm gear 41' meshes with the worm above described, and is mounted rigidly upon a revoluble driven shaft 42. A bracket 43 is provided at its ends with uprights 44 integral therewith, these parts being used for supporting the driven shaft 42, as will be understood from Fig. 2.

A bracket 45 is provided with upright portions 46, 47 integral therewith, these upright portions being used for supporting the drivlng shaft 16. Mounted upon the lower end of the lever 26 is a head 48 carrying a block 49 of insulating material. Mounted upon this block and projecting therefrom is a blade 50 of metal. This blade is adapted to slide in between the contact springs 11, 12 so as to connect them together. A board 51 is conveniently employed for supporting many of the parts above described, as will be understood from Fig. 1.

The operation of my device is as follows: The switch 7 being closed, the operator pulls the rod 36 downward, which causes the shoulder 32 to pass the shoulder 30. The tension of the leaf spring 28 causes the lever 26 to move a little to the right so that the shoulder 30 looks with the shoulder 32, as indicated in Fig. 1. This movement causes the blade '50 to enter between the contact spings 1 1, 12, thereby completing the following c1rcuit: Battery 9, wire 8, switch 7, wire 6, motor 5, wire 14, contact spring 12, blade 50, contact spring 11, wire 10, back to battery 9. This energizes the motor 5 and causes its armature 15 and the driving shaft 16 to rotate. The tension of the main spring 38 being proportioned according to the load to be driven and adjusted by means of the nut 39 and nut lock 40, the tension of the s ring 38 remains constant and the worm, whi e rotating under a normal load, maintains its position constantly. During this time the pin 17 rests against the bottom of the slot 18. Suppose, now, that in conse uence of the load becomlng excessive or 0 some driven part being obstructed in its movement, the main spring 38 is unable to resist the excessive pressure upon it, and that the spring yields in consequence, the worm 19, moving to the right, as elsewhere explained, the result is that the worm is thereby disconnected from the pin 17 and the driven mechanism is thus disconnected fromthe driving mechanism, the shaft 16 now turning idly. The movement of the worm to the right causes the lever 23 to rock and this lever in turn causes a rocking movement to take place in the lever 26, whereby the switch knife 50 is withdrawn from the switch and the electric circuit broken so as to stop the motor.

As a concrete instance, I may suggest that in a particular machine the driven mechan ism will not run properly unless the main spring 38 be under a tension represented by pounds pressure. In this instance the nut 39 is adjusted so as to confer a pressure of 100 ounds upon the spring and the nut 39 is then ocked by aid of the lock nut 40.. If a margin be desired over this pressure, it can be increased say to 150 pounds. In this instance, the clogging of any of the driven gearing or the obstruction of rotation of the shaft 42 or any parts driven by it, will cause the worm to throw that is, todisconnect itself from the shaft 16 and to shut off the power.

The principle underlying the longitudinal axial movement of the worm 19 is simply this: The worm gear 41 being unable to turn with proper freedom and the motor 5 continuing to rotate the shaft 16, the worm must move axially because of the inclination of the threads upon the worm. In other words, the worm gear 41 must rotate or else the worm must both rotate and move in the general longitudinal direction of its own axis.

While in the resent application I show the shaft 16 and't e worm as coupled together by aid of a pin 17 and slot 18, constituting together a type of clutch, it will be noted that any other clutch mechanism may be employed as an equivalent. It will also be noted that I do not limit myself by showing the various levers 33, 26, 23, for obviously the worm gear and main spring can be made to perform their res ective ofiiees through agencies of other kin s than the levers mentioned.

While for convenience I show as a source of ower an electric current drivin a motor and controlled by a switch, it will be understood that any other source of power may be emlployed. v

aving thus described my invention, I claim as new and desire to secure by Letters Patent:

' 1. The combination of a revoluble shaft, a plurality of stationary bearin s for sup ort mg the same, a substantia y cylin rical Worm encircling said shaft and loose relativelythereto, said worm bein disposed intermediate said bearings, clutc mechanism for connecting and disconnecting said worm and said shaft, a spring dis osed adjacent to said worm for actuating said clutch mechanism, said spring encircling said shaft and turning therewith, said spring being always under tension, a worm ear meshing with said worm and driven thereby, means for bearings, clutch mechanism for purpose of shutting off the source of power.

2. The combination of a source of power, a revoluble shaft turned thereby, bearings .for supporting said shaft, a worm'loosely encircling said shaft and adapted to move axially along the same, said worm bein disposed intermediate said bearings, clutc mechanism for preventin relative rotation between said shaft and sai worm, a spring encircling said shaft and adapted to hold said worm in such position that said clutch mechanism normally prevents relative rotation between said worm and said shaft, said spring being revoluble with said shaft, means controllable at will for governing the tension of said spring relatively to said worm, a revoluble gear member meshing with said worm and turned thereby, said worm being adapted to move endwise and increase the tension of said spring whenever movement of said revoluble gear member is obstructed, and means controllable by the lon itudinal axial movement of said worm or disconnecting said source of power from said revoluble member. 3. The combination of a source of power, a revoluble shaft turned by said source of power, bearings for supportin said revolu le shaft, a worm loosely encirc ing said shaft and adapted to move axially along the same, said worm being disposed intermediate said reventin relative rotation between said sha t and sai worm, a spring encircling said shaft and adapted to hold said worm in such osition that said clutch mechanism norma y prevents relative rotation between said worm and said shaft, said spring bein revoluble with said shaft, means controlla le at for overning the tension of said spring relative y to said worm, a revoluble ear meshin with said worm and turned tfiereby, sai

vworm being adapted to move endwise and increase the tension of said spring whenever movement of said revoluble gear member is obstructed, and means controllable by the longitudinal axial movement of said Worm for disconnecting said source ofpower from said revoluble member, said means including a lever provided with a portion disposed intermediate said spring and said worm.

4. The combination of a driven member, a'

driving member temporarily connected therewith and adapted to be disconnected therefrom when sa d driven member is obstructed in its movement, means controllable by the release of said driving member from said driven member for disconnecting the source of ower therefrom, and mechanism controllab e partly by said driven member and partly by said driving member for disconnecting said driving member from said driven member.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD EIiLETT TALIAFERRO. Witnesses:

A. D. AITKEN,

Jos. F. SonLoTTER. 

